From £9,400
T.I Building is a trusted extension builder serving customers in Hillsborough and the surrounding area. Contact us to today to get a competitive qu...
From £9,384
Relax... you have found a reliable extension builder in Hillsborough. Finch Construction NI is a friendly and reliable company based in Hillsboroug...
From £9,136
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
From £9,336
Trusted and professional extension builder in Hillsborough. Experienced in all extension buildering work and keeping within budget and on quote. Be...
From £9,176
Trusted and professional extension builder in Hillsborough. Experienced in all extension buildering work and keeping within budget and on quote. Ex...
From £9,512
N W Doyle & Son is a trusted extension builder serving customers in Hillsborough and the surrounding area. Contact us to today to get a competitive...
From £9,448
Trusted and professional extension builder in Hillsborough. Experienced in all extension buildering work and keeping within budget and on quote. Th...
From £9,368
Relax... you have found a reliable extension builder in Hillsborough. SM Plumbing & Heating is a friendly and reliable company based in Hillsboroug...

Outbuilding costs in Hillsborough range from the cheapest of £9,136 (Mount Oriel Conversions & Extensions based in BT8) to the dearest of £10,560 (Build a Boiler based in BT67), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in Hillsborough by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Hillsborough and Culcavy | £25 | £170 |
| Outbuilding near Lisburn | £24 | £164 |
| Outbuilding near Maghaberry | £31 | £205 |
| Outbuilding near Ballynahinch | £19 | £189 |
| Outbuilding near Carryduff | £23 | £158 |
| Outbuilding near Saintfield | £23 | £162 |
| Outbuilding near Waringstown | £23 | £167 |
| Outbuilding near Banbridge | £29 | £205 |
| Outbuilding near Belfast | £23 | £161 |
| Outbuilding near Crumlin | £26 | £194 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £16,981

Two storey extension - £87,221

Build a timber frame extension - £25,481

Build a swimming pool - £80,481

Single storey extension - £44,616

Side return extension - £35,659

Install an RSJ - £1,681

Outbuilding - £9,481

Build a Mansard loft conversion - £51,481

Loft conversion - £28,883

Build a kitchen extension - £41,481

Hip to gable loft conversion - £41,481

Granny annexe - £86,481

Garden office - £9,481

Convert a Garage - £15,481

Garage - £17,981

Build a flat roof extension - £21,481

Build a dormer loft conversion - £41,481

Concrete foundations - £5,731

Convert a bungalow loft - £28,481

Convert a basement - £31,659